After trying most of the Hearts card games in Aces Store, this app Hearts ended up being my favorite and the one I've been enjoying for years now. It has the smoothest animation, game flow and by far the best designed controls of all the Hearts games I've tried. It's the only one that offers the exact card animation speed that I prefer. Also,you can tap to skip animations when you want to speed things up. No other game I tried can do that. The UX is so nice, most other Hearts games feel amateurish by comparison. Also, I haven't had any login or other technical problems in years. I came here to leave a 5-star review in appreciation and was shocked to find I had left a harsh 2-star review many years ago and forgot about it. The two highlighted Store reviews are out-of-date (one of them is 4 years old). Yes, the game engine could be improved in a couple places—such as opponents giving up their high hearts too quickly on the hardest mode when it should be obvious you're making a run to shoot the moon. For me, the next hardest mode below that can often be harder to beat. None of the games I've tried have been perfect when it comes to emulating human players of various skill levels. Nevertheless, this app Hearts is one of the best.